Chapter 6 Quiz

Which IPv4 address can a host use to ping the loopback interface?

127.0.0.1

What is a hop? How man to pc 4 from pc1 pc1-sw- x-x-x-sw pc4?

A hop is an intermediary Layer 3 device that a packet has to traverse to reach its destination. In this case, the number of hops a packet has to traverse from PC-1 to PC-4 is three, as there are three routers from source to destination. pc1-sw- x-x-x-sw pc4

Which key combination allows a user to abort setup mode?

Ctl-C

When transporting data from real-time applications, such as streaming audio and video, which field in the IPv6 header can be used to inform the routers and switches to maintain the same path for the packets in the same conversation?

Flow Label The Flow Label in IPv6 header is a 20-bit field that provides a special service for real-time applications. This field can be used to inform routers and switches to maintain the same path for the packet flow so that packets will not be reordered.

A router may have to fragment a packet when forwarding it from one medium to another medium that has a smaller ___?

MTU <Maximun Transmission Unit>

If there are two or more possible routes to the same destination, the ____ is used to determine which route is used in the routing table.

Metric If there are two or more possible routes to the same destination, the metric is used to decide which route appears in the routing table.

The acronym is used to define the process that allows multiple devices to share a single routable IP address.

NAT or PAT Refer to curriculum topic: 6.1.4 NAT or Network Address Translation is the process of modifying the IP packet header information on packets going outside the corporate network. Corporate networks typically use private addresses on the inside LAN and need a public address to be able to communicate through the WAN.

How does the network layer use the MTU value?

The MTU is passed to the network layer by the data link layer`

Within a production network, what is the purpose of configuring a switch with a default gateway address?

The default gateway address is used to forward packets originating from the switch to remote networks. A default gateway address allows a switch to forward packets that originate on the switch to remote networks. A default gateway address on a switch does not provide Layer 3 routing for PCs that are connected on that switch. A switch can still be accessible from Telnet as long as the source of the Telnet connection is on the local network.

Which value, that is contained in an IPv4 header field, is decremented by each router that receives a packet?

Time-to-Live When a router receives a packet, the router will decrement the Time-to-Live (TTL) field by one. When the field reaches zero, the receiving router will discard the packet and will send an ICMP Time Exceeded message to the sender.

During the boot process, where will the router bootstrap program look for the IOS image by default?

flash

Which portion of the network layer address does a router use to forward packets?

network portion

What are two functions that are provided by the network layer?

providing end devices with a unique network identifier directing data packets to destination hosts on other networks the network layer is primarily concerned with passing data from a source to a destination on another network. IP addresses supply unique identifiers for the source and destination. The network layer provides connectionless, best-effort delivery. Devices rely on higher layers to supply services to processes.